src/crypt_reencrypt.c

   1 /*
   2  * crypt_reencrypt - crypt utility for offline reencryption
   3  *
   4  * Copyright (C) 2012 Milan Broz All rights reserved.
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * version 2 as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18  */
  19
  20 /* The code works as follows:
  21  *  - create backup (detached) headers fo old and new device
  22  *  - mark original device unusable
  23  *  - maps two devices, one with old header one with new onto
  24  *    the _same_ underlying device
  25  *  - with direct-io reads old device and copy to new device in defined steps
  26  *  - keps simple off in file (allows restart)
  27  *  - there is several windows when corruption can happen
  28  *
  29  * null target
  30  * dmsetup create x --table "0 $(blockdev --getsz DEV) crypt cipher_null-ecb-null - 0 DEV 0"
  31  */
  32 #define _LARGEFILE64_SOURCE
  33 #define _FILE_OFFSET_BITS 64
  34
  35 #include <string.h>
  36 #include <stdio.h>
  37 #include <stdlib.h>
  38 #include <stdint.h>
  39 #include <stdarg.h>
  40 #include <inttypes.h>
  41 #include <errno.h>
  42 #include <unistd.h>
  43 #include <sys/stat.h>
  44 #include <sys/ioctl.h>
  45 #include <sys/time.h>
  46 #include <linux/fs.h>
  47 #include <fcntl.h>
  48 #include <limits.h>
  49 #include <signal.h>
  50 #include <libcryptsetup.h>
  51 #include <popt.h>
  52
  53 #include "cryptsetup.h"
  54
  55 static int opt_verbose = 0;
  56 static int opt_debug = 0;
  57 static const char *opt_cipher = NULL;
  58 static const char *opt_hash = NULL;
  59 static const char *opt_key_file = NULL;
  60 static int opt_iteration_time = 1000;
  61 static int opt_batch_mode = 0;
  62 static int opt_version_mode = 0;
  63 static int opt_random = 0;
  64 static int opt_urandom = 0;
  65 static int opt_bsize = 4;
  66 static int opt_new = 0;
  67 static int opt_directio = 0;
  68 static int opt_write_log = 0;
  69 static const char *opt_new_file = NULL;
  70
  71 static const char **action_argv;
  72 sigset_t signals_open;
  73
  74 struct {
  75         char *device;
  76         char *device_uuid;
  77         uint64_t device_size;
  78         uint64_t device_offset;
  79         uint64_t device_shift;
  80
  81         int in_progress:1;
  82         enum { FORWARD = 0, BACKWARD = 1 } reencrypt_direction;
  83
  84         char header_file_org[PATH_MAX];
  85         char header_file_new[PATH_MAX];
  86         char log_file[PATH_MAX];
  87
  88         char crypt_path_org[PATH_MAX];
  89         char crypt_path_new[PATH_MAX];
  90         int log_fd;
  91
  92         char *password;
  93         size_t passwordLen;
  94         int keyslot;
  95
  96         struct timeval start_time, end_time;
  97 } rnc;
  98
  99 char MAGIC[]   = {'L','U','K','S', 0xba, 0xbe};
 100 char NOMAGIC[] = {'L','U','K','S', 0xde, 0xad};
 101 int  MAGIC_L = 6;
 102
 103 typedef enum {
 104         MAKE_UNUSABLE,
 105         MAKE_USABLE,
 106         CHECK_UNUSABLE
 107 } header_magic;
 108
 109 __attribute__((format(printf, 5, 6)))
 110 static void clogger(struct crypt_device *cd, int level, const char *file,
 111                    int line, const char *format, ...)
 112 {
 113         va_list argp;
 114         char *target = NULL;
 115
 116         va_start(argp, format);
 117
 118         if (vasprintf(&target, format, argp) > 0) {
 119                 if (level >= 0) {
 120                         crypt_log(cd, level, target);
 121                 } else if (opt_debug)
 122                         printf("# %s\n", target);
 123         }
 124
 125         va_end(argp);
 126         free(target);
 127 }
 128
 129 static void _log(int level, const char *msg, void *usrptr __attribute__((unused)))
 130 {
 131         switch(level) {
 132
 133         case CRYPT_LOG_NORMAL:
 134                 fputs(msg, stdout);
 135                 break;
 136         case CRYPT_LOG_VERBOSE:
 137                 if (opt_verbose)
 138                         fputs(msg, stdout);
 139                 break;
 140         case CRYPT_LOG_ERROR:
 141                 fputs(msg, stderr);
 142                 break;
 143         case CRYPT_LOG_DEBUG:
 144                 if (opt_debug)
 145                         printf("# %s\n", msg);
 146                 break;
 147         default:
 148                 fprintf(stderr, "Internal error on logging class for msg: %s", msg);
 149                 break;
 150         }
 151 }
 152
 153 static void _quiet_log(int level, const char *msg, void *usrptr)
 154 {
 155         if (!opt_verbose && (level == CRYPT_LOG_ERROR || level == CRYPT_LOG_NORMAL))
 156                 level = CRYPT_LOG_VERBOSE;
 157         _log(level, msg, usrptr);
 158 }
 159
 160 /* The difference in seconds between two times in "timeval" format. */
 161 double time_diff(struct timeval start, struct timeval end)
 162 {
 163         return (end.tv_sec - start.tv_sec)
 164                 + (end.tv_usec - start.tv_usec) / 1E6;
 165 }
 166
 167 static int alignment(int fd)
 168 {
 169         int alignment;
 170
 171         alignment = fpathconf(fd, _PC_REC_XFER_ALIGN);
 172         if (alignment < 0)
 173                 alignment = 4096;
 174         return alignment;
 175 }
 176
 177 static int device_magic(header_magic set_magic)
 178 {
 179         char *buf = NULL;
 180         size_t block_size = 512;
 181         int r, devfd;
 182         ssize_t s;
 183
 184         devfd = open(rnc.device, O_RDWR | O_DIRECT);
 185         if (devfd == -1)
 186                 return errno == EBUSY ? -EBUSY : -EINVAL;
 187
 188         if (posix_memalign((void *)&buf, alignment(devfd), block_size)) {
 189                 r = -ENOMEM;
 190                 goto out;
 191         }
 192
 193         s = read(devfd, buf, block_size);
 194         if (s < 0 || s != block_size) {
 195                 log_verbose(_("Cannot read device %s.\n"), rnc.device);
 196                 close(devfd);
 197                 return -EIO;
 198         }
 199
 200         if (set_magic == MAKE_UNUSABLE && !memcmp(buf, MAGIC, MAGIC_L)) {
 201                 log_dbg("Marking LUKS device %s unusable.", rnc.device);
 202                 memcpy(buf, NOMAGIC, MAGIC_L);
 203                 r = 0;
 204
 205         } else if (set_magic == MAKE_USABLE && !memcmp(buf, NOMAGIC, MAGIC_L)) {
 206                 log_dbg("Marking LUKS device %s usable.", rnc.device);
 207                 memcpy(buf, MAGIC, MAGIC_L);
 208                 r = 0;
 209         } else if (set_magic == CHECK_UNUSABLE) {
 210                 r = memcmp(buf, NOMAGIC, MAGIC_L) ? -EINVAL : 0;
 211                 if (!r)
 212                         rnc.device_uuid = strndup(&buf[0xa8], 40);
 213                 goto out;
 214         } else
 215                 r = -EINVAL;
 216
 217         if (!r) {
 218                 if (lseek(devfd, 0, SEEK_SET) == -1)
 219                         goto out;
 220                 s = write(devfd, buf, block_size);
 221                 if (s < 0 || s != block_size) {
 222                         log_verbose(_("Cannot write device %s.\n"), rnc.device);
 223                         r = -EIO;
 224                 }
 225         } else
 226                 log_dbg("LUKS signature check failed for %s.", rnc.device);
 227 out:
 228         if (buf)
 229                 memset(buf, 0, block_size);
 230         free(buf);
 231         close(devfd);
 232         return r;
 233 }
 234
 235 static int create_empty_header(const char *new_file, uint64_t size)
 236 {
 237         int fd, r = 0;
 238         char *buf;
 239
 240         log_dbg("Creating empty file %s of size %lu.", new_file, (unsigned long)size);
 241
 242         if (!(buf = malloc(size)))
 243                 return -ENOMEM;
 244         memset(buf, 0, size);
 245
 246         fd = creat(new_file, S_IRUSR|S_IWUSR);
 247         if(fd == -1) {
 248                 free(buf);
 249                 return -EINVAL;
 250         }
 251
 252         if (write(fd, buf, size) < size)
 253                 r = -EIO;
 254
 255         close(fd);
 256         free(buf);
 257         return r;
 258 }
 259
 260 static int write_log(void)
 261 {
 262         static char buf[512];
 263         ssize_t r;
 264
 265         //log_dbg("Updating LUKS reencryption log offset %" PRIu64 ".", offset);
 266         memset(buf, 0, sizeof(buf));
 267         snprintf(buf, sizeof(buf), "# LUKS reencryption log, DO NOT EDIT OR DELETE.\n"
 268                 "version = %d\nUUID = %s\ndirection = %d\n"
 269                 "offset = %" PRIu64 "\nshift = %" PRIu64 "\n# EOF\n",
 270                 1, rnc.device_uuid, rnc.reencrypt_direction,
 271                 rnc.device_offset, rnc.device_shift);
 272
 273         lseek(rnc.log_fd, 0, SEEK_SET);
 274         r = write(rnc.log_fd, buf, sizeof(buf));
 275         if (r < 0 || r != sizeof(buf))
 276                 return -EIO;
 277
 278         return 0;
 279 }
 280
 281 static int parse_line_log(const char *line)
 282 {
 283         uint64_t u64;
 284         int i;
 285         char s[64];
 286
 287         /* comment */
 288         if (*line == '#')
 289                 return 0;
 290
 291         if (sscanf(line, "version = %d", &i) == 1) {
 292                 if (i != 1) {
 293                         log_dbg("Log: Unexpected version = %i", i);
 294                         return -EINVAL;
 295                 }
 296         } else if (sscanf(line, "UUID = %40s", s) == 1) {
 297                 if (!rnc.device_uuid || strcmp(rnc.device_uuid, s)) {
 298                         log_dbg("Log: Unexpected UUID %s", s);
 299                         return -EINVAL;
 300                 }
 301         } else if (sscanf(line, "direction = %d", &i) == 1) {
 302                 log_dbg("Log: direction = %i", i);
 303                 rnc.reencrypt_direction = i;
 304         } else if (sscanf(line, "offset = %" PRIu64, &u64) == 1) {
 305                 log_dbg("Log: offset = %" PRIu64, u64);
 306                 rnc.device_offset = u64;
 307         } else if (sscanf(line, "shift = %" PRIu64, &u64) == 1) {
 308                 log_dbg("Log: shift = %" PRIu64, u64);
 309                 rnc.device_shift = u64;
 310         } else
 311                 return -EINVAL;
 312
 313         return 0;
 314 }
 315
 316 static int parse_log(void)
 317 {
 318         static char buf[512];
 319         char *start, *end;
 320         ssize_t s;
 321
 322         s = read(rnc.log_fd, buf, sizeof(buf));
 323         if (s == -1)
 324                 return -EIO;
 325
 326         buf[511] = '\0';
 327         start = buf;
 328         do {
 329                 end = strchr(start, '\n');
 330                 if (end) {
 331                         *end++ = '\0';
 332                         if (parse_line_log(start)) {
 333                                 log_err("Wrong log format.\n");
 334                                 return -EINVAL;
 335                         }
 336                 }
 337
 338                 start = end;
 339         } while (start);
 340
 341         return 0;
 342 }
 343
 344 static int open_log(void)
 345 {
 346         int flags;
 347         struct stat st;
 348
 349         if(stat(rnc.log_file, &st) < 0) {
 350                 log_dbg("Creating LUKS reencryption log file %s.", rnc.log_file);
 351
 352                 // FIXME: move that somewhere else
 353                 rnc.reencrypt_direction = BACKWARD;
 354
 355                 flags = opt_directio ? O_RDWR|O_CREAT|O_DIRECT : O_RDWR|O_CREAT;
 356                 rnc.log_fd = open(rnc.log_file, flags, S_IRUSR|S_IWUSR);
 357                 if (rnc.log_fd == -1)
 358                         return -EINVAL;
 359                 if (write_log() < 0)
 360                         return -EIO;
 361         } else {
 362                 log_dbg("Log file %s exists, restarting.", rnc.log_file);
 363                 flags = opt_directio ? O_RDWR|O_DIRECT : O_RDWR;
 364                 rnc.log_fd = open(rnc.log_file, flags);
 365                 if (rnc.log_fd == -1)
 366                         return -EINVAL;
 367                 rnc.in_progress = 1;
 368         }
 369
 370         /* Be sure it is correct format */
 371         return parse_log();
 372 }
 373
 374 static void close_log(void)
 375 {
 376         log_dbg("Closing LUKS reencryption log file %s.", rnc.log_file);
 377         if (rnc.log_fd != -1)
 378                 close(rnc.log_fd);
 379 }
 380
 381 static int activate_luks_headers(void)
 382 {
 383         struct crypt_device *cd = NULL, *cd_new = NULL;
 384         int r;
 385
 386         log_dbg("Activating LUKS devices from headers.");
 387
 388         if ((r = crypt_init(&cd, rnc.header_file_org)) ||
 389             (r = crypt_load(cd, CRYPT_LUKS1, NULL)) ||
 390             (r = crypt_set_data_device(cd, rnc.device)))
 391                 goto out;
 392
 393         if ((r = crypt_activate_by_passphrase(cd, rnc.header_file_org,
 394                 CRYPT_ANY_SLOT, rnc.password, rnc.passwordLen,
 395                 CRYPT_ACTIVATE_READONLY|CRYPT_ACTIVATE_PRIVATE)) < 0)
 396                 goto out;
 397
 398         if ((r = crypt_init(&cd_new, rnc.header_file_new)) ||
 399             (r = crypt_load(cd_new, CRYPT_LUKS1, NULL)) ||
 400             (r = crypt_set_data_device(cd_new, rnc.device)))
 401                 goto out;
 402
 403         if ((r = crypt_activate_by_passphrase(cd_new, rnc.header_file_new,
 404                 CRYPT_ANY_SLOT, rnc.password, rnc.passwordLen,
 405                 CRYPT_ACTIVATE_SHARED|CRYPT_ACTIVATE_PRIVATE)) < 0)
 406                 goto out;
 407 out:
 408         crypt_free(cd);
 409         crypt_free(cd_new);
 410         return r;
 411 }
 412
 413 static int backup_luks_headers(void)
 414 {
 415         struct crypt_device *cd = NULL, *cd_new = NULL;
 416         struct crypt_params_luks1 params = {0};
 417         char cipher [MAX_CIPHER_LEN], cipher_mode[MAX_CIPHER_LEN];
 418         int r;
 419
 420         log_dbg("Creating LUKS header backup for device %s.", rnc.device);
 421         if ((r = crypt_init(&cd, rnc.device)) ||
 422             (r = crypt_load(cd, CRYPT_LUKS1, NULL)))
 423                 goto out;
 424
 425         crypt_set_confirm_callback(cd, NULL, NULL);
 426         if ((r = crypt_header_backup(cd, CRYPT_LUKS1, rnc.header_file_org)))
 427                 goto out;
 428
 429         if ((r = create_empty_header(rnc.header_file_new,
 430                                      crypt_get_data_offset(cd) * 512)))
 431                 goto out;
 432
 433         params.hash = opt_hash ?: DEFAULT_LUKS1_HASH;
 434         params.data_alignment = crypt_get_data_offset(cd);
 435         params.data_device = rnc.device;
 436
 437         if ((r = crypt_init(&cd_new, rnc.header_file_new)))
 438                 goto out;
 439
 440         if (opt_random)
 441                 crypt_set_rng_type(cd_new, CRYPT_RNG_RANDOM);
 442         else if (opt_urandom)
 443                 crypt_set_rng_type(cd_new, CRYPT_RNG_URANDOM);
 444
 445         if (opt_iteration_time)
 446                 crypt_set_iteration_time(cd_new, opt_iteration_time);
 447
 448         if (opt_cipher) {
 449                 r = crypt_parse_name_and_mode(opt_cipher, cipher, NULL, cipher_mode);
 450                 if (r < 0) {
 451                         log_err(_("No known cipher specification pattern detected.\n"));
 452                         goto out;
 453                 }
 454         }
 455
 456         if ((r = crypt_format(cd_new, CRYPT_LUKS1,
 457                         opt_cipher ? cipher : crypt_get_cipher(cd),
 458                         opt_cipher ? cipher_mode : crypt_get_cipher_mode(cd),
 459                         crypt_get_uuid(cd),
 460                         NULL, crypt_get_volume_key_size(cd), &params)))
 461                 goto out;
 462
 463         if ((r = crypt_keyslot_add_by_volume_key(cd_new, rnc.keyslot,
 464                                 NULL, 0, rnc.password, rnc.passwordLen)) < 0)
 465                 goto out;
 466
 467 out:
 468         crypt_free(cd);
 469         crypt_free(cd_new);
 470         return r;
 471 }
 472
 473 static void remove_headers(void)
 474 {
 475         struct crypt_device *cd = NULL;
 476
 477         if (crypt_init(&cd, NULL))
 478                 return;
 479         crypt_set_log_callback(cd, _quiet_log, NULL);
 480         (void)crypt_deactivate(cd, rnc.header_file_org);
 481         (void)crypt_deactivate(cd, rnc.header_file_new);
 482         crypt_free(cd);
 483 }
 484
 485 static int restore_luks_header(const char *backup)
 486 {
 487         struct crypt_device *cd = NULL;
 488         int r;
 489
 490         r = crypt_init(&cd, rnc.device);
 491
 492         if (r == 0) {
 493                 crypt_set_confirm_callback(cd, NULL, NULL);
 494                 r = crypt_header_restore(cd, CRYPT_LUKS1, backup);
 495         }
 496
 497         crypt_free(cd);
 498         return r;
 499 }
 500
 501 void print_progress(uint64_t bytes, int final)
 502 {
 503         uint64_t mbytes = bytes / 1024 / 1024;
 504         struct timeval now_time;
 505         double tdiff;
 506
 507         gettimeofday(&now_time, NULL);
 508         if (!final && time_diff(rnc.end_time, now_time) < 0.5)
 509                 return;
 510
 511         rnc.end_time = now_time;
 512
 513         if (opt_batch_mode)
 514                 return;
 515
 516         tdiff = time_diff(rnc.start_time, rnc.end_time);
 517         if (!tdiff)
 518                 return;
 519
 520         log_err("\33[2K\rProgress: %5.1f%%, time elapsed %3.1f seconds, %4"
 521                 PRIu64 " MB written, speed %5.2f MB/s%s",
 522                 (double)bytes / rnc.device_size * 100,
 523                 time_diff(rnc.start_time, rnc.end_time),
 524                 mbytes, (double)(mbytes) / tdiff,
 525                 final ? "\n" :"");
 526 }
 527
 528 static int copy_data_forward(int fd_old, int fd_new, size_t block_size, void *buf, uint64_t *bytes)
 529 {
 530         ssize_t s1, s2;
 531
 532         *bytes = 0;
 533         while (rnc.device_offset < rnc.device_size) {
 534                 s1 = read(fd_old, buf, block_size);
 535                 if (s1 < 0 || (s1 != block_size && (rnc.device_offset + s1) != rnc.device_size)) {
 536                         log_err("Read error, expecting %d, got %d.\n", (int)block_size, (int)s1);
 537                         return -EIO;
 538                 }
 539                 s2 = write(fd_new, buf, s1);
 540                 if (s2 < 0) {
 541                         log_err("Write error, expecting %d, got %d.\n", (int)block_size, (int)s2);
 542                         return -EIO;
 543                 }
 544                 rnc.device_offset += s1;
 545                 if (opt_write_log && write_log() < 0) {
 546                         log_err("Log write error, some data are perhaps lost.\n");
 547                         return -EIO;
 548                 }
 549
 550                 *bytes += (uint64_t)s2;
 551                 print_progress(*bytes, 0);
 552         }
 553
 554         return 0;
 555 }
 556
 557 static int copy_data_backward(int fd_old, int fd_new, size_t block_size, void *buf, uint64_t *bytes)
 558 {
 559         ssize_t s1, s2, working_block;
 560         off64_t working_offset;
 561
 562         *bytes = 0;
 563         while (rnc.device_offset) {
 564                 if (rnc.device_offset < block_size) {
 565                         working_offset = 0;
 566                         working_block = rnc.device_offset;
 567                 } else {
 568                         working_offset = rnc.device_offset - block_size;
 569                         working_block = block_size;
 570                 }
 571
 572                 if (lseek64(fd_old, working_offset, SEEK_SET) < 0 ||
 573                     lseek64(fd_new, working_offset, SEEK_SET) < 0) {
 574                         log_err("Cannot seek to device offset.\n");
 575                         return -EIO;
 576                 }
 577 //log_err("off: %06d, size %06d\n", working_offset, block_size);
 578
 579                 s1 = read(fd_old, buf, working_block);
 580                 if (s1 < 0 || (s1 != working_block)) {
 581                         log_err("Read error, expecting %d, got %d.\n", (int)block_size, (int)s1);
 582                         return -EIO;
 583                 }
 584                 s2 = write(fd_new, buf, working_block);
 585                 if (s2 < 0) {
 586                         log_err("Write error, expecting %d, got %d.\n", (int)block_size, (int)s2);
 587                         return -EIO;
 588                 }
 589                 rnc.device_offset -= s1;
 590                 if (opt_write_log && write_log() < 0) {
 591                         log_err("Log write error, some data are perhaps lost.\n");
 592                         return -EIO;
 593                 }
 594
 595                 *bytes += (uint64_t)s2;
 596                 print_progress(*bytes, 0);
 597         }
 598
 599         return 0;
 600 }
 601
 602 static int copy_data(void)
 603 {
 604         size_t block_size = opt_bsize * 1024 * 1024;
 605         int fd_old = -1, fd_new = -1;
 606         int r = -EINVAL;
 607         void *buf = NULL;
 608         uint64_t bytes = 0;
 609
 610         fd_old = open(rnc.crypt_path_org, O_RDONLY | (opt_directio ? O_DIRECT : 0));
 611         if (fd_old == -1)
 612                 goto out;
 613
 614         fd_new = open(rnc.crypt_path_new, O_WRONLY | (opt_directio ? O_DIRECT : 0));
 615         if (fd_new == -1)
 616                 goto out;
 617
 618         if (lseek(fd_old, rnc.device_offset, SEEK_SET) == -1)
 619                 goto out;
 620
 621         if (lseek(fd_new, rnc.device_offset, SEEK_SET) == -1)
 622                 goto out;
 623
 624         /* Check size */
 625         if (ioctl(fd_old, BLKGETSIZE64, &rnc.device_size) < 0)
 626                 goto out;
 627
 628         if (posix_memalign((void *)&buf, alignment(fd_new), block_size)) {
 629                 r = -ENOMEM;
 630                 goto out;
 631         }
 632
 633         // FIXME: all this should be in init
 634         if (!rnc.in_progress && rnc.reencrypt_direction == BACKWARD)
 635                 rnc.device_offset = rnc.device_size;
 636
 637         gettimeofday(&rnc.start_time, NULL);
 638
 639         if (rnc.reencrypt_direction == FORWARD)
 640                 r = copy_data_forward(fd_old, fd_new, block_size, buf, &bytes);
 641         else
 642                 r = copy_data_backward(fd_old, fd_new, block_size, buf, &bytes);
 643         print_progress(bytes, 1);
 644
 645         if (r < 0)
 646                 log_err("ERROR during reencryption.\n");
 647
 648         if (write_log() < 0)
 649                 log_err("Log write error, ignored.\n");
 650
 651 out:
 652         if (fd_old != -1)
 653                 close(fd_old);
 654         if (fd_new != -1)
 655                 close(fd_new);
 656         free(buf);
 657         return r;
 658 }
 659
 660 static int initialize_uuid(void)
 661 {
 662         struct crypt_device *cd = NULL;
 663         int r;
 664
 665         /* Try to load LUKS from device */
 666         if ((r = crypt_init(&cd, rnc.device)))
 667                 return r;
 668         crypt_set_log_callback(cd, _quiet_log, NULL);
 669         r = crypt_load(cd, CRYPT_LUKS1, NULL);
 670         if (!r)
 671                 rnc.device_uuid = strdup(crypt_get_uuid(cd));
 672         else
 673                 /* Reencryption already in progress - magic header? */
 674                 r = device_magic(CHECK_UNUSABLE);
 675
 676         crypt_free(cd);
 677         return r;
 678 }
 679
 680 static int initialize_passphrase(const char *device)
 681 {
 682         struct crypt_device *cd = NULL;
 683         int r;
 684
 685         if ((r = crypt_init(&cd, device)) ||
 686             (r = crypt_load(cd, CRYPT_LUKS1, NULL)) ||
 687             (r = crypt_set_data_device(cd, rnc.device)))
 688                 goto out;
 689
 690         if ((r = crypt_get_key(_("Enter LUKS passphrase: "),
 691                           &rnc.password, &rnc.passwordLen,
 692                           0, 0, opt_key_file,
 693                           0, 0, cd)) <0)
 694                 goto out;
 695
 696         if ((r = crypt_activate_by_passphrase(cd, NULL,
 697                 CRYPT_ANY_SLOT, rnc.password, rnc.passwordLen, 0) < 0))
 698                 goto out;
 699
 700         if (r >= 0) {
 701                 rnc.keyslot = r;
 702                 r = 0;
 703         }
 704 out:
 705         crypt_free(cd);
 706         return r;
 707 }
 708
 709 static int initialize_context(const char *device)
 710 {
 711         log_dbg("Initialising reencryption context.");
 712
 713         rnc.log_fd =-1;
 714
 715         if (!(rnc.device = strndup(device, PATH_MAX)))
 716                 return -ENOMEM;
 717 /*
 718         if (opt_new_file && !create_uuid()) {
 719                 log_err("Cannot create fake header.\n");
 720                 return -EINVAL;
 721         }
 722 */
 723         if (initialize_uuid()) {
 724                 log_err("No header found on device.\n");
 725                 return -EINVAL;
 726         }
 727
 728         /* Prepare device names */
 729         if (snprintf(rnc.log_file, PATH_MAX,
 730                      "LUKS-%s.log", rnc.device_uuid) < 0)
 731                 return -ENOMEM;
 732         if (snprintf(rnc.header_file_org, PATH_MAX,
 733                      "LUKS-%s.org", rnc.device_uuid) < 0)
 734                 return -ENOMEM;
 735         if (snprintf(rnc.header_file_new, PATH_MAX,
 736                      "LUKS-%s.new", rnc.device_uuid) < 0)
 737                 return -ENOMEM;
 738
 739         /* Paths to encrypted devices */
 740         if (snprintf(rnc.crypt_path_org, PATH_MAX,
 741                      "%s/%s", crypt_get_dir(), rnc.header_file_org) < 0)
 742                 return -ENOMEM;
 743         if (snprintf(rnc.crypt_path_new, PATH_MAX,
 744                      "%s/%s", crypt_get_dir(), rnc.header_file_new) < 0)
 745                 return -ENOMEM;
 746
 747         remove_headers();
 748
 749         /* Block ctrl+c */
 750         // FIXME: add some routine to handle it
 751         sigemptyset(&signals_open);
 752         sigaddset(&signals_open, SIGINT);
 753         sigprocmask(SIG_SETMASK, &signals_open, NULL);
 754
 755         return open_log();
 756 }
 757
 758 static void destroy_context(void)
 759 {
 760         log_dbg("Destroying reencryption context.");
 761
 762         close_log();
 763         remove_headers();
 764
 765         if ((rnc.reencrypt_direction == FORWARD &&
 766              rnc.device_offset == rnc.device_size) ||
 767              rnc.device_offset == 0) {
 768                 unlink(rnc.log_file);
 769                 unlink(rnc.header_file_org);
 770                 unlink(rnc.header_file_new);
 771         }
 772
 773         crypt_safe_free(rnc.password);
 774
 775         free(rnc.device);
 776         free(rnc.device_uuid);
 777
 778         sigprocmask(SIG_UNBLOCK, &signals_open, NULL);
 779 }
 780
 781 int run_reencrypt(const char *device)
 782 {
 783         int r = -EINVAL;
 784
 785         if (initialize_context(device))
 786                 goto out;
 787
 788         log_dbg("Running reencryption.");
 789
 790         if (!rnc.in_progress) {
 791                 if ((r = initialize_passphrase(rnc.device)) ||
 792                     (r = backup_luks_headers()) ||
 793                     (r = device_magic(MAKE_UNUSABLE)))
 794                         goto out;
 795         } else {
 796                 if ((r = initialize_passphrase(rnc.header_file_org)))
 797                         goto out;
 798         }
 799
 800         if ((r = activate_luks_headers()))
 801                 goto out;
 802
 803         if ((r = copy_data()))
 804                 goto out;
 805
 806         r = restore_luks_header(rnc.header_file_new);
 807 out:
 808         destroy_context();
 809         return r;
 810 }
 811
 812 static __attribute__ ((noreturn)) void usage(poptContext popt_context,
 813                                              int exitcode, const char *error,
 814                                              const char *more)
 815 {
 816         poptPrintUsage(popt_context, stderr, 0);
 817         if (error)
 818                 log_err("%s: %s\n", more, error);
 819         poptFreeContext(popt_context);
 820         exit(exitcode);
 821 }
 822
 823 static void help(poptContext popt_context,
 824                  enum poptCallbackReason reason __attribute__((unused)),
 825                  struct poptOption *key,
 826                  const char *arg __attribute__((unused)),
 827                  void *data __attribute__((unused)))
 828 {
 829         usage(popt_context, EXIT_SUCCESS, NULL, NULL);
 830 }
 831
 832 static void _dbg_version_and_cmd(int argc, const char **argv)
 833 {
 834         int i;
 835
 836         log_std("# %s %s processing \"", PACKAGE_NAME, PACKAGE_VERSION);
 837         for (i = 0; i < argc; i++) {
 838                 if (i)
 839                         log_std(" ");
 840                 log_std("%s", argv[i]);
 841         }
 842         log_std("\"\n");
 843 }
 844
 845 int main(int argc, const char **argv)
 846 {
 847         static struct poptOption popt_help_options[] = {
 848                 { NULL,    '\0', POPT_ARG_CALLBACK, help, 0, NULL,                         NULL },
 849                 { "help",  '?',  POPT_ARG_NONE,     NULL, 0, N_("Show this help message"), NULL },
 850                 { "usage", '\0', POPT_ARG_NONE,     NULL, 0, N_("Display brief usage"),    NULL },
 851                 POPT_TABLEEND
 852         };
 853         static struct poptOption popt_options[] = {
 854                 { NULL,                '\0', POPT_ARG_INCLUDE_TABLE, popt_help_options, 0, N_("Help options:"), NULL },
 855                 { "version",           '\0', POPT_ARG_NONE, &opt_version_mode,          0, N_("Print package version"), NULL },
 856                 { "verbose",           'v',  POPT_ARG_NONE, &opt_verbose,               0, N_("Shows more detailed error messages"), NULL },
 857                 { "debug",             '\0', POPT_ARG_NONE, &opt_debug,                 0, N_("Show debug messages"), NULL },
 858                 { "block-size",        'B',  POPT_ARG_INT, &opt_bsize,                  0, N_("Reencryption block size"), N_("MB") },
 859                 { "new-header",        'N',  POPT_ARG_INT, &opt_new,                    0, N_("Create new header, need size on the end of device"), N_("MB") },
 860                 { "new-crypt",         'f',  POPT_ARG_STRING, &opt_new_file,            0, N_("Log suffix for new reencryption file."), NULL },
 861                 { "cipher",            'c',  POPT_ARG_STRING, &opt_cipher,              0, N_("The cipher used to encrypt the disk (see /proc/crypto)"), NULL },
 862                 { "hash",              'h',  POPT_ARG_STRING, &opt_hash,                0, N_("The hash used to create the encryption key from the passphrase"), NULL },
 863                 { "key-file",          'd',  POPT_ARG_STRING, &opt_key_file,            0, N_("Read the key from a file."), NULL },
 864                 { "iter-time",         'i',  POPT_ARG_INT, &opt_iteration_time,         0, N_("PBKDF2 iteration time for LUKS (in ms)"), N_("msecs") },
 865                 { "batch-mode",        'q',  POPT_ARG_NONE, &opt_batch_mode,            0, N_("Do not ask for confirmation"), NULL },
 866                 { "use-random",        '\0', POPT_ARG_NONE, &opt_random,                0, N_("Use /dev/random for generating volume key."), NULL },
 867                 { "use-urandom",       '\0', POPT_ARG_NONE, &opt_urandom,               0, N_("Use /dev/urandom for generating volume key."), NULL },
 868                 { "use-directio",      '\0', POPT_ARG_NONE, &opt_directio,              0, N_("Use direct-io when accesing devices."), NULL },
 869                 { "write-log",         '\0', POPT_ARG_NONE, &opt_write_log,             0, N_("Update log file after every block."), NULL },
 870                 POPT_TABLEEND
 871         };
 872         poptContext popt_context;
 873         int r;
 874
 875         crypt_set_log_callback(NULL, _log, NULL);
 876         log_err("WARNING: this is experimental code, it can completely break your data.\n");
 877
 878         setlocale(LC_ALL, "");
 879         bindtextdomain(PACKAGE, LOCALEDIR);
 880         textdomain(PACKAGE);
 881
 882         popt_context = poptGetContext(PACKAGE, argc, argv, popt_options, 0);
 883         poptSetOtherOptionHelp(popt_context,
 884                                N_("[OPTION...] <device>]"));
 885
 886         while((r = poptGetNextOpt(popt_context)) > 0) {
 887                 if (r < 0)
 888                         break;
 889         }
 890
 891         if (r < -1)
 892                 usage(popt_context, EXIT_FAILURE, poptStrerror(r),
 893                       poptBadOption(popt_context, POPT_BADOPTION_NOALIAS));
 894         if (opt_version_mode) {
 895                 log_std("%s %s\n", PACKAGE_NAME, PACKAGE_VERSION);
 896                 poptFreeContext(popt_context);
 897                 exit(EXIT_SUCCESS);
 898         }
 899
 900         action_argv = poptGetArgs(popt_context);
 901         if(!action_argv)
 902                 usage(popt_context, EXIT_FAILURE, _("Argument required."),
 903                       poptGetInvocationName(popt_context));
 904
 905         if (opt_random && opt_urandom)
 906                 usage(popt_context, EXIT_FAILURE, _("Only one of --use-[u]random options is allowed."),
 907                       poptGetInvocationName(popt_context));
 908
 909         if (opt_new && !opt_new_file)
 910                 usage(popt_context, EXIT_FAILURE, _("You have to use -f with -N."),
 911                       poptGetInvocationName(popt_context));
 912
 913         if (opt_debug) {
 914                 opt_verbose = 1;
 915                 crypt_set_debug_level(-1);
 916                 _dbg_version_and_cmd(argc, argv);
 917         }
 918
 919         r = run_reencrypt(action_argv[0]);
 920
 921         poptFreeContext(popt_context);
 922
 923         /* Translate exit code to simple codes */
 924         switch (r) {
 925         case 0:         r = EXIT_SUCCESS; break;
 926         case -EEXIST:
 927         case -EBUSY:    r = 5; break;
 928         case -ENOTBLK:
 929         case -ENODEV:   r = 4; break;
 930         case -ENOMEM:   r = 3; break;
 931         case -EPERM:    r = 2; break;
 932         case -EINVAL:
 933         case -ENOENT:
 934         case -ENOSYS:
 935         default:        r = EXIT_FAILURE;
 936         }
 937         return r;
 938 }